As other posters have said, those countries have huge geographical issues which historically preventing large population growth.
Now that food isn’t a problem, the biggest challenges to immigration are economic and cultural. Economic and that those nations have an extremely high cost of living meaning you need a good income to live, plus strong labour laws which discourage businesses using cheap non-native labour. Culturally, very few people looking for a new home are likely to learn Norwegian. It’s a completely useless langauge in much of the world, unlike England or French for instance.
In terms of local population growth, as a highly education and wealthy society, families are generally small, limiting growth.
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